| Summary: | 碩士 === 國立中山大學 === 環境工程研究所 === 107 === World Health Organization identifies formaldehyde carcinogenic and teratogenic to human when subjected to long-term exposure. Despite that, urea-formaldehyde resins (UF) are frequently used in decorative materials such as plywood. Free formaldehyde remaining in the UF is emitted into the environment as temperature and humidity changes. Prolonged exposure to formaldehyde will cause harm to the human body by causing a chronic respiratory disease. As an abatement photocatalysis is one of the techniques for degrading VOCs such as formaldehyde. Among them, titanium dioxide (TiO2) photocatalyst is widely used in academic research and material development due to its stable reaction, non-toxicity and low cost. However, titanium dioxide has the disadvantages of low specific surface area, high energy gap and ultraviolet light absorption. Therefore, some studies have used noble metals such as platinum to enhance the catalytic effect. However, setback these metals is their higher cost. Therefore, this study investigates the use of zinc (Zn), tin (Sn) modified commercial titanium dioxide (type P25), combined with regenerated zeolite, to evaluate the benefits of formaldehyde degradation. By combining the photocatalyst with the regenerated zeolite, formaldehyde can be chemisorbed onto the zeolite pores. The modification method adopts the microwave hydrothermal method, which can effectively reduce the synthesis reaction time and reduce the reaction temperature to save energy. In this study, the use of zeolite has shown to be effective for regeneration, and sustainable application. In this work, modified zeolite, the molar ratio of tin to the titanium dioxide, microwave hydrothermal synthesis temperature, calcination temperature and zeolite to type P25 weight ratio has been discussed for the removal of formaldehyde.
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